Determine the heat given off to the surroundings when 9.0 g of aluminum reacts according to the equation 2Al + Fe₂O₃ $\rarr$ Al₂O₃ + 2Fe, $\Delta$H°_rxn= -849 kJ/mol.

Question

Quizplus · Accepted Answer

The molar mass of aluminum (Al) is approximately 27 g/mol. For 9.0 g of Al, the moles of Al are 9.0 g / 27 g/mol = 0.333 mol. The reaction involves 2 moles of Al, so the heat released for 0.333 mol is (0.333 mol / 2 mol) * 849 kJ/mol = 141.5 kJ, which is approximately 1.4 * 10^2 kJ.

Determine the Heat Given Off to the Surroundings When 9 →\rarr→

Determine the Heat Given Off to the Surroundings When 9 $\rarr$